Reinforced-concrete building construction.



0. S. CLARK. REINFORCED CONCRETE BUILDING CONSTRUCTION. APPLICATIONFILED NOV. 11.1916.

1,231,240. Patented June 26, 1911.

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OBERLIN S. CLARK, OF NORTH WEYIVIOUTH, MASSACHUSETTS.

REINFORCED-CONCRETE BUILDING CONSTRUCTION.

Specification of Letters Patent.

Patented June 26, 1917..

Application filed November 11, 1916. Serial N 0. 130,906.

To all whom it may concern:

Be it known that I, OBERLIN S. CLARK, a citizen of the United States,and a resident of North VVeymouth, in the county of Norfolk and State ofMassachusetts, have invented a new and useful Improvement inReinforced-Concrete Building Construction, of which the following is aspecification.

My invention relates to reinforced concrete building construction of theunit type and more especially to the roofs of reinforced concretebuildings, and my object is to provide a simple and effective means formaking such roofs watertight.

My invention will be described in connection with the accompanyingdrawings in which- Figure 1 is a plan view of a reinforced concrete roofembodying a form of my invention. Fig. 2 is a section of a modification.Fig. 3 is a section on the line 55 of Fig. 1.

In the particular drawings selected for more fully disclosing theseveral forms of my invention, 11, 11 represent roof beams suitablysupported between pilasters (not shown) and carrying the roof slabs 23,each suitably reinforced by expanded metal or wire mesh 39. The roofslabs slope downwardly from the saddle board 40 which extends throughoutthe length of the roof and covers the joints between the inner ends ofeach pair of roof slabs. In Fig. 1 which represents a portion of theroof of a small building, such as a garage, the adjacent ends of eachpair of roof slabs are transversely grooved as shown at 24 and the coverstrip 25 is placed over the grooved portion of the slabs with its endsextending slightly be yond the grooves. The grooves break the capillarypassage between the slabs and cover strip and carry' ofi any water whichmay work under the latter.

In Fig. 1 I show a modified construction for insuringawater-tightjointbetween the roof slabs, the upper edgeof the roof beams 11 being insuch case provided with a groove 26 extending through the length thereofimmediately under the drip 26 on the meeting edges of a pair of slabs.

For making the roof of a large building Watertight I prefer theconstruction shown in Figs. 1 and 3 in which the top of each roof beamis provided with the groove 26 referred to above and the meeting edgesof each pair of slabs are rabbeted, the lower rabbeted portion beingprovided with a longitudinal groove 41 communicating with the groove inthe upper edges of the roof beams which support the slab. It will beunderstood of course that the joints between the meeting edges of eachpair of slabs are pointed with cement mortar and that for clearness ofillustration the joint in Fig. 3 is shown as open. Any moisture that mayfind its way through the joint into the groove 41 will be conducted tothe groove 26 in the top of the roof beams and thereby carried away.

It will be understood that various modifications may be made in thearrangements herein particularly shown and described without departingfrom the principle of my invention.

I claim:

A reinforced concrete construction, comprising in combination aplurality of roof slabs, extending lengthwise of the roof the meetingedges of said slabs being rabbeted and the lower portion thereof havinga groove extending throughout the length of the slab, and lengthwise ofthe roof and roof beams supporting said slabs, the upper edge of eachbeam having a longitudinal groove at right angles to the roof-slabgrooves, said roof-slab grooves communicating with the grooves in theroof beams.

In testimony whereof, I have hereunto subscribed my name this 8th day ofNov. 1916.

OBERLIN S. CLARK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

